Effect of Surface Treatment on Multi Walled Carbon Nanotubes by Organic Hydrazine
鄧智烜1,2,3*, 許瑤真2, 王本誠3
1先進光源學程 工科組, 國立清華大學, 新竹市, Taiwan
2國家同步輻射研究中心, 新竹市, Taiwan
3工程與系統科學系, 國立清華大學, 新竹市, Taiwan
* presenting author:Jhih-Syuan Teng, email:ssabe7@hotmail.com
We used hydrazine (HZ-1), Phenylhydrazine (HZ-2),
2-nitrophenylhydrazine (HZ-3) and 2,4-dinitrophenylhydrazine (HZ-4) to react with multi walled carbon nanotubes(MWCNTs). There are different functional groups in HZ-1, HZ-2, HZ-3 and HZ-4. If MWCNTs can introduce there different functional groups, there are some benefit (1) conductivity of MWCNTs can be improved (2) turn work function of MWCNTs.

In our experiment, we use UV lamp to irradiation HZ-1, HZ-2, HZ-3 and HZ-4 solution, further to cover with MWCNTs thin films 30 minutes. After 30 minutes treatment, using 200ml Di water to rinse MWCNTs thin film to clean substrate. Finally, we will use thermal condition to insure the HZ can be remove completely.

To understand the effect of HZ on MWCNTs, we use field emission scanning microscope, four-point probe, raman spectroscopy, ultra-violet photoelectron spectroscopy (UPS) and x-ray photoemission spectroscopy (XPS) to do series measurement. At result, we find in case of HZ-3 can modification MWCNTs efficiently. In part of conductivity, after HZ-3 treatment, sheet resistance improve to 0.68 times. Shows in the process, MWCNTs can be modification by HZ-3 and have some covalent bond generation on MWCNTs surface. In part of structure variety, we find MWCNTs after HZ-3 treatment, there are CNT-NH₂, CNT-NO₂ and CNT-NH-C structure generate contributed by HZ-3. And further to pass 340⁰C thermal anneal, there are mainly CNT-NH₂ and less CNT-NH-C remain on MWCNTs surface, but CNT-NO₂ is gone, here shows that 340⁰C temperature will break CNT-NO₂. Compare the conductivity and structure variety, The improve of conductivity are contribution to CNT-NH₂, this amino group (–NH₂) introduce on MWCNTs, surface will become electron rich, so conductivity have been improve.

Keywords: carbon nanotubes, organic hydrazine